@article{Lv2025, 
author = {Shuai Lv and Yanjun Jiang and Muyao Liu and Jingao Li and Zihao Zhao and Xinyu Wang and Baoshan Li and Shuo Liu and Fangzhou Cui and Dongdong Lv and Yanan Yang and Long Xia},
title = {Vacancy-mediated electromagnetic loss tuning in Cr-doped lanthanum manganite perovskites for broadband and high-intensity microwave absorption},
year = {2025},
journal = {Journal of Advanced Ceramics},
volume = {14},
number = {12},
pages = {9221202},
keywords = {perovskite, vacancy engineering, electromagnetic (EM) wave absorption, polarization loss},
url = {https://www.sciopen.com/article/10.26599/JAC.2025.9221202},
doi = {10.26599/JAC.2025.9221202},
abstract = {Escalating electromagnetic (EM) pollution and advanced stealth technologies require next-generation microwave absorbers that combine broadband response, strong attenuation, and lightweight characteristics with high-temperature stability. In this work, a vacancy-mediated strategy is proposed to tailor EM losses in Cr-doped lanthanum manganite perovskites (LaMn1−xCrxO3) synthesized via a sol–gel method. The cooperative modulation between Mn-site cation vacancies and oxygen vacancies enables a well-balanced contribution of polarization loss and conduction loss, resulting in excellent absorption performance. Specifically, LaMn0.85Cr0.15O3 achieves a remarkable minimum reflection loss (RLmin) of −75.37 dB and an effective absorption bandwidth (EAB) of 6.0 GHz at a thickness of only 2.8 mm. Structural and spectroscopic analyses reveal that Cr3+ substitution induces Mn vacancies and modulates oxygen vacancy concentrations, thereby generating defect dipoles and facilitating carrier migration. Density functional theory (DFT) calculations further elucidate the role of Cr-induced defect states in enhancing conduction and polarization losses. This vacancy-engineered approach not only establishes a new paradigm for designing high-efficiency perovskite-based microwave absorbers but also offers significant potential for high-temperature EM compatibility applications.}
}